FIGURE 1.
(a) The predicted proportion of offspring sired by the second male P2 (with 95% confidence bands) increases with the relative difference in copula durations and in sperm lengths between the competing brothers (first experiment), (b) whereby female body size (HTL: Hind‐tibia length) incurs additional complex effects. To depict interactions among the continuous variables, sperm length and female body size were partitioned into three bins representing the mean, −1 SD smaller, and +1 SD larger than the mean values. The two‐way interaction in panel a is based on the full data set (N = 81) of the first experiment, whereas the three panels in B reflect the three‐way interaction of the reduced data set (removing P2 values of 0 and 1; N = 52)